P1751 – Shift Solenoid Performance (Toyota)

Description

The ECM detected improper performance of a shift solenoid affecting gear shifting.

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Symptoms

Harsh shifting
Delayed shifting
Slipping
Poor acceleration
Check engine light

Causes

Weak solenoid
Dirty ATF
Valve body restriction
Wiring issues
TCM driver fault

Diagnosis

Check ATF condition
Test solenoid resistance
Inspect wiring
Scan TCM data
Inspect valve body

Repair

Replace solenoid
Refill ATF
Clean valve body
Repair wiring